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20130211
20130219
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PBS
Feb 15, 2013 10:00pm PST
earth, at least in space terms. as this nasa animation shows, the asteroid was just over 17,000 miles away from earth, traveling at about eight miles per second, actually inside a ring of television and weather satellites that surround the planet. named da-14, the asteroid was half the size of a football field. it passed, we can happily report, without incident. here to tell us about both events is astrophysicist and author neil degrasse tyson, director of the hayden planetarium in new york city. let's start with what happened in russia. how unusual was that in terms of size and impact? >> well, we couldn't know precisely how common that would be. all we can do is sort of look back at otr sort of repord su eves. for example, there was an air blast that happened in the airspace over india and pakistan back in 1990s. which happened to occur while they were in intense conversations about their nuclear buildup of arm ament. and so such a blast mimics greatly what would happened with the nuclear blast. it is an instant deposit of energy in the atmosphere. and so forth nationally we w
Search Results 0 to 1 of about 2 (some duplicates have been removed)